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Method for performing mobility process of nb-iot terminal, and apparatus therefor

Active Publication Date: 2019-11-21
KT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present disclosure allows for NB-IoT terminals to quickly resume service even when there is a sudden interruption in service due to movement or degradation of the communication channel. Additionally, the disclosure allows for the NB-IoT terminal to support mobility and provide a continuous and stable service.

Problems solved by technology

For example, unlike a typical LTE terminal, an IoT terminal is not supported by handover technology.
Also, an IoT terminal does not perform an operation of measuring a channel state of a channel connected thereto and periodically delivering the same to a base station.
Accordingly, even when an IoT terminal moves and leaves the coverage of a base station or when a radio state is seriously degraded, a base station does not understand the current status.
When such a procedure takes place, an IoT terminal is problematic in that the same cannot provide a service until a channel state becomes better or the same transitions to an idle state and completes execution of a reconnection procedure.
That is, a problem may arise in that an IoT terminal does not perform a mobility handling procedure and thus a service interruption occurs.

Method used

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  • Method for performing mobility process of nb-iot terminal, and apparatus therefor
  • Method for performing mobility process of nb-iot terminal, and apparatus therefor

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Experimental program
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Effect test

fourth embodiment

ting Mobility Through RRC Connection Re-Establishment Procedure

[0120]The use of a general handover procedure, applied to a typical terminal, for an NB-IoT terminal becomes a significant overhead. That is, a method for causing an NB-IoT terminal to transmit, in time, measurement reporting and causing a base station to perform a handover on the basis of the measurement reporting may become a significant overhead. In order to make this situation better, the following mobility support method may be provided to a connected terminal.

[0121]For example, a base station may inform of a terminal a critical criterion for triggering cell change for the terminal. When the terminal reaches the criterion, the terminal may trigger an RRC connection re-establishment procedure.

[0122]To this end, an event for triggering cell change may be defined.

[0123]For example, an event for triggering cell change (e.g., cell change criterion) may be defined as an A3 event (neighbor becomes amount of offset better t...

fifth embodiment

rting Mobility Through RRC Connection Resume

[0167]The use of a general handover procedure, applied to a typical terminal, for an NB-IoT terminal becomes a significant overhead. That is, a method for causing an NB-IoT terminal to transmit, in time, measurement reporting and causing a base station to perform a handover on the basis of the measurement reporting may become a significant overhead. In order to make this situation better, the following mobility support method can be provided to a connected terminal.

[0168]For example, a base station may inform of a terminal a critical criterion that triggers cell change for the terminal. When the terminal reaches the criterion (after cell change), the terminal may trigger an RRC connection resume.

[0169]An event for triggering cell change (e.g., cell change criterion) may be defined.

[0170]For example, an event for triggering cell change (e.g., cell change criterion) may be defined as an A3 event (neighbor becomes amount of offset better than...

first embodiment

sting MME for Terminal Context for Terminal Reconfiguration / Change / Re-Establishment by Target Base Station

[0328]When a terminal transmits, to a target base station, an RRC message for requesting cell change in order to directly attempt to change a cell, the target base station receiving the relevant message enables the terminal having requested cell change to configure / reconfigure / resume / change / re-establish an RRC connection of the terminal.

[0329]In order to configure / reconfigure / resume / change a connection of the terminal having requested cell change, the target base station may request a core network entity (in LTE, an MME, that is, a core network control plane entity) for a terminal context of the terminal. To this end, the terminal may include, as a terminal identifier, an S-TMSI for identification of a serving MME in the RRC message transmitted to the target base station so as to request cell change. An S-TMSI may include an MME Code (MMEC) and an m-Temporary Mobile Subscriber I...

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Abstract

Provided are a method and an apparatus for a NarrowBand-Internet of Things (NB-IoT) terminal to perform a mobility process. The method may include: transmitting an RRC connection re-establishment request message to a base station when a pre-set event occurs; receiving an RRC connection re-establishment message from the base station; and resuming a signaling radio bearer on the basis of the RRC connection re-establishment message.

Description

TECHNICAL FIELD[0001]The present disclosure relates to a method and an apparatus for handling mobility of a NarrowBand-Internet of Things (NB-IoT) terminal, and more specifically, to a method and an apparatus for maintaining service continuity for an NB-IoT terminal.BACKGROUND ART[0002]Research on NB-IoT technology has been conducted by a related international standard organization. The purpose of the relevant research is to research technology of IoT terminals for improving indoor coverage improved by utilizing a cellular network, for supporting large-scale low-speed terminals, for low-latency sensitivity, for ultra-low terminal cost, for low power consumption, and for an optimized network architecture.[0003]Such an IoT terminal essentially requires low unit price and low power consumption for long-term use. Accordingly, an IoT terminal has many differences from a typical terminal employing existing LTE technology in terms of supported functionality.[0004]For example, unlike a typi...

Claims

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Application Information

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IPC IPC(8): H04W36/30H04W36/00H04W36/08H04W8/08H04W76/19H04W8/26H04W4/80H04W76/27H04W8/24
CPCH04W8/26H04W76/19H04W4/80H04W8/24H04W36/0033H04W8/08H04W76/27H04W36/08H04W36/305H04W36/0079H04W4/70H04W36/36
Inventor HONG, SUNG-PYOCHOI, WOO-JIN
Owner KT CORP
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